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'Save to disk' is exactly what it says it saves the file to disk. calibre stores the ebook files in the library but the metadata is stored separately in the metadata.db file. When you use 'Save to disk' it will save the file in your requested location and update the metadata on that file.
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So does this mean that if I import a file into my Calibre library, then use Calibre to change the metadata for that book, the metadata stored in the ebook file itself remains what it was when it was imported - the changes are stored only in the metadata.db file but the book file itself isn't updated? Is there a reason for this - a reason that the file metadata isn't updated when I change it in Calibre? And could this explain why sometimes when I send an ebook to my Kindle, some of the metadata changes I've made in Calibre aren't reflected when the ebook gets to my Kindle? (Sometimes I've had to make changes to the metadata of the Calibre library file using something like mobi2mobi in order to make the metadata correct on the Kindle.)
It sounds like in order to make the changes to the file metadata, I'd have to do a "save to disk" and then re-import the ebook, which seems strange to me.
As for the Calibre library...I understand what it is now. Is there a way to move my entire library? What if I no longer want it in "My Documents/Calibre ebooks" but instead want it somewhere else - can I do that easily? (And I still don't understand about the time for loading a library into a new version of Calibre - although maybe it has to do with this, with moving the library location?)
Thank you for your help!